Gas-phase experiments on Au(III) photochemistry

Jesse C Marcum; Sydney H Kaufman; J Mathias Weber

doi:10.1021/jp200797v

Gas-phase experiments on Au(III) photochemistry

J Phys Chem A. 2011 Apr 14;115(14):3006-15. doi: 10.1021/jp200797v. Epub 2011 Mar 21.

Authors

Jesse C Marcum¹, Sydney H Kaufman, J Mathias Weber

Affiliation

¹ JILA, NIST and Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309, United States.

PMID: 21417481
DOI: 10.1021/jp200797v

Abstract

Irradiation of AuCl(4)(-) and AuCl(2)(OH)(2)(-) in the gas-phase using ultraviolet light (220-415 nm) leads to their dissociation. Observed fragment ions for AuCl(4)(-) are AuCl(3)(-) and AuCl(2)(-) and for AuCl(2)(OH)(2)(-) are AuCl(2)(-) and AuClOH(-). All fragment channels correspond to photoreduction of the gold atom to either Au(II) or Au(I) depending on the number of neutral ligands lost. Fragment branching ratios of AuCl(4)(-) are observed to be highly energy dependent and can be explained by comparison of the experimental data to calculated threshold energies obtained using density functional theory. The main observed spectral features are attributed to ligand-to-metal charge transfer transitions. These results are discussed in the context of the molecular-level mechanisms of Au(III) photochemistry.

Publication types

Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

Gases / chemistry
Gold Compounds / chemistry*
Photochemistry
Quantum Theory

Substances

Gases
Gold Compounds